New conversation manager

xF2 Add-on New conversation manager 1.8

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Added 'Exclude user groups' to options page.
Now disallows "Invite more" if member is only allowed to start a new conversation with staff.
Added code to make more compatible with other add-ons.
Added Usernames filed to the options page. Regular members can only start a new conversation with these usernames set in the options page.
New posts in Options page can now be set to desired number.
Fixed issue when creating a new conversation if the Recipients input was left empty it would throw a server error message.
Now properly getting and returning the parent code.